DOWNLOAD Harman Kardon AVR 2550 (serv.man6) Service Manual ↓ Size: 3.2 MB | Pages: 50 in PDF or view online for FREE

AVR 2 5 5 0   Audio/VideoReceiver

Service Manual

AVR 2550

Power for the Digital Revolution

™

®

TECHNICAL SPECIFICATIONS

Audio Section
Stereo Mode 
Continuous Average Power (FTC)

50 Watts per channel, 20Hz–20kHz,
@ < 0.07% THD, both channels driven into 8 ohms

Five-Channel Surround Modes 
Power Per Individual Channel

Front L&R channels:
40 Watts per channel,
@ < 0.07% THD, 20Hz–20kHz into 8 ohms

Center channel:
40 Watts, @ < 0.07% THD, 20Hz–20kHz into 8 ohms

Surround channels:
40 Watts per channel,
@ < 0.07% THD, 20Hz–20kHz into 8 ohms

Input Sensitivity/Impedance 

Linear (High Level)

200mV/47kohms

Signal-to-Noise Ratio (IHF-A)

95dB

Surround System Adjacent Channel Separation 

Analog Decoding 

40dB 

(Pro Logic, etc.) 
Dolby Digital (AC-3) 

55dB 

DTS

55dB

Frequency Response 

@ 1W (+0dB, –3dB)

10Hz–100kHz

High Instantaneous 
Current Capability (HCC)

±25 Amps

Transient Intermodulation 
Distortion (TIM)

Unmeasurable

Rise Time

16 µsec

Slew Rate

40V/µsec

Frequency Range

87.5–108MHz

Usable Sensitivity

IHF 1.3 µV/13.2dBf

Signal-to-Noise Ratio

Mono/Stereo: 70/65dB (DIN)

Distortion

Mono/Stereo: 0.15/0.3%

Stereo Separation

35dB @ 1kHz

Selectivity

±300kHz: 65dB

Image Rejection

80dB

IF Rejection

90dB

Frequency Range

522–1620kHz

Signal-to-Noise Ratio

45dB

Usable Sensitivity

Loop: 500µV

Distortion

1kHz, 50% Mod: 0.8%

Selectivity

±9kHz: 30dB

Video Format

PAL/NTSC

Input Level/Impedance

1Vp-p/75 ohms

Output Level/Impedance 1Vp-p/75 ohms
Video Frequency 
Response

10Hz–8MHz (–3dB)

Power Requirement

AC 220-240V/50Hz

Power Consumption

72W idle, 580W maximum 
(2 channels driven)

Dimensions (Max)

Width

440mm 

Height

166mm 

Depth

365mm

Weight

10.6 kg

Depth measurement includes knobs, buttons and terminal connections.
Height measurement includes feet and chassis.
All features and specifications are subject to change without notice.

Harman Kardon is a registered trademark, and Power for the digital revolution is a
trademark, of Harman International Industries, Inc.

*Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic”, and the Double-D symbol are 
trademarks of Dolby Laboratories, Inc.
Confidential Unpublished Works. ©1992–1999 Dolby Laboratories, Inc.
All rights reserved.

†“DTS” and “DTS Digital Surround” are registered trademarks of 
Digital Theater Systems, Inc.

††UltraStereo is a trademark of UltraStereo Corp.

VMAx is a trademark of Harman International Industries, Inc., and is an 
implementation of Cooper Bauck Transaural Stereo under patent license.

Logic 7 is a registered trademark of Lexicon, Inc.

Crystal is a registered trademark of Cirrus Logic Corp.

48

TROUBLESHOOTING GUIDE

TROUBLESHOOTING

SYMPTOM

CAUSE

SOLUTION

Unit does not function when Main

• No AC Power

• Make certain AC power cord is plugged into a live outlet

Power Switch is pushed

• Check to see whether outlet is switch-controlled

Display lights, but no sound

• Intermittent input connections

• Make certain that all input and speaker connections are secure

or picture

• Mute is on

• Press Mute button

• Volume control is down

• Turn up volume control

Unit turns on, but front-panel 

• Display brightness is turned off

• Follow the instructions in the Display Brightness section 

display does not light up

on page 30 so that the display is set to VFD FULL

No sound from any speaker;

• Amplifier is in protection mode 

• Check speaker wire connections for shorts at receiver and 

light around power switch is red

due to possible short

speaker ends 

• Amplifier is in protection mode 

• Contact your local Harman Kardon service center, which you can

due to internal problems

locate by visiting our Web site at www.harmankardon.com

No sound from surround or

• Incorrect surround mode

• Select a mode other than Stereo or Dolby 3 Stereo

center speakers

• Input is monaural

• There is no surround information from mono sources

• Incorrect configuration 

• Check speaker mode configuratioin                                       

• Stereo or Mono program material

• The surround decoder may not create center- or rear-channel 

information from nonencoded programs

Unit does not respond to

• Weak batteries in remote

• Change remote batteries

remote commands

• Wrong device selected

• Press the AVR selector

• Remote sensor is obscured

• Make certain front-panel sensor is visible to remote

or connect remote sensor

Intermittent buzzing in tuner

• Local interference

• Move unit or antenna away from computers, fluorescent 

lights, motors or other electrical appliances

Letters flash in the channel indicator

• Digital audio feed paused

• Resume play for DVD

display and digital audio stops

• Check that Digital Input is selected

Measurement condition

. No input signal or volume position is minimum.

Standard value.

. Ideal current = 48mA ( 

±

 5%)

. Ideal DC Voltage = 21.12mV ( 

±

 5%)

DC VOLTMETER..............Connect to CN61, CN62, CN63, CN64, CN65

NO.

Channel

Adjust for

Adjustment

1

Front Left

21.12mV (±5%)

VR61

CN61

VR61

2

Front Right

21.12mV (±5%)

21.12mV (±5%)

21.12mV (±5%)

21.12mV (±5%)

VR62

CN62

VR62

3

Center

VR63

CN63

VR63

4

Surround Left

VR64

CN64

VR64

5

Surround Right

VR65

VR65

CN65